Same situation for me, picked up an old frame that took 27's. 700c look fine but give me a drop of 65mm, so I need these...... http://www.sjscycles.co.uk/tektro-tektro-r556-caliper-brake-55-73-mm-very-deep-drop-nut-fitting-prod73/?src=froogle They're a bolt fitting which sounds like the mount you need.
I considered sourcing 27's but that limits tyre choice so I'll brave in with long brakes.
@Northern_Rob started
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Same situation for me, picked up an old frame that took 27's. 700c look fine but give me a drop of 65mm, so I need these...... http://www.sjscycles.co.uk/tektro-tektro-r556-caliper-brake-55-73-mm-very-deep-drop-nut-fitting-prod73/?src=froogle They're a bolt fitting which sounds like the mount you need.
I considered sourcing 27's but that limits tyre choice so I'll brave in with long brakes.